Valve-operating mechanism.



J. SABO.

VALVE OPERATING MECHANISM.

APPLIGATION FILED APR.19,1913.

1,089,382 Patented Mar. 3, 1914.

III 1 Lifmozt- UNITED STATES PATENT OFFICE. JOHN SABO, 0F CLEVELAND, OHID: ASSIGNOB, BY MESNE ASSIGNMENTS, '10 LEWIS SANDS, OF CLEVELAND, OHIO.

VALVE-OPERATING MECHANISM.

oeassa Specification of Letters Patent.

Patented Mar. 3, 1914.

To all whom it may concern:

Be it known that 1, JOHN SABo, a citizen of the United States of America, residingat Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new ta-ins to make and'use the same.

This invention relates to new and useful improvements in valve operating mechanism and particularly to mechanism of thls character for automatically operating a gas valve for regulating the flow of gas to a burner used in connection with a waterheater.

One object of this invention is to provide valve operating mechanism of this kind which will be extremely sensitive and which can be readily adjusted so that the desired temperature of the water car be constantly maintained in the boiler.

With this object in view and with the intention of securing other advantages which will hereinafter appear, my invention consists in the features of construction and combination of parts, the preferred form of which is shown in the accompanying drawings, described in the specification and pointed out in the claims.

In the accompanying drawings I have shown my valve operating mechanism in connection with a valve which is designed to control the admission of gas from a supply pipe to a chamber, from whence the gas passes through a feed pipe to a burner (not shown) and as my valve operating mecha nism is primarily designed to be automatically operated I have also shown a thermostatic device suitable for actuating said valve operating mechanism.

In the drawings Figure l is a top plan view of a device embodyin my invention, part being broken away. Fig. 2 is a section on line 2 2, Fig. 1. Fig. 3 is an enlarged detail view. Fig. 4 is a section on line 44, Fig. 3.

Again referring to the drawings, 1 represents the bottom plate and 2 a hollow member adapted to fit down on said plate and the two sections together form a gas-tight chamber 3. The bottom plate 1 and the hollow member 2 are preferably secured together by a screw 4. Near one end of said plate is arranged a cornection or pipe5 and on sald pipe 5 within the chamber 3 is forfn'eda valve seat 6. The outer end ofthe pipe 5 is adapted to receive one end of a pipe 7 which. connects with the gas main. Adjacent to the pipe 5 is arranged a pipe 8, the inner end of which is. preferably flush with the surface of the plate 1 and the outer end thereof is adapted to receive one end of a pipe 9 which connects with the burner. It will therefore be understood that the gasenters the chamber 3 through the pipe 5 and then passes out through the pipe 8. A small passageway 10 is formed In the plate 1 and one end thereof communicates with the chamber 3 and the other end communicates with the pipe 5 below the valve seat 6. This passageway 10 supplies a small quantity of gas which is not controlled by the main valve hereinafter described. A needle valve 11 is preferably provided for regulating the flow of the gas through the passageway 10.

On the plate 1 within the chamber 3 are arranged a pair of small standards 14. A pin or small shaft 15 extends between said standards and on said shaft is supported a carriage 16 which is free to rock on said shaft 15. This carriage 16 is yoke-shaped in cross-section and is provided with a forwardly extending arm 17. A pin 19 is mounted in the carriage 16 and on said pin 19 is fulcrumed a valve operating lever 20 and the point of support for said lever is nearer to the rear end than to the forward end of said lever.

A valve 22 is provided for closing the pipe 5 and said valve is adapted to rest on thevalve seat 6. This valve 22 is connected with the forward end of the lever 20 by a ball and socket joint, shown at 23. The rear end of said lever 20 is supported by a coil spring 24.

In the top of the member 2 is formed a screw-threaded opening 26 which is adapted to receive a thumb screw 27 and the inner end of said thumb screw 27 is adapted to bear against the arm 17 on the carriage 16. The thumb screw 27 is preferably provided with an index finger 28 which is arranged to travel over a dial 29, on the outer surface of the member 2, which has characters indicating different degrees of temperature.

It will be readily understood that when the thumb-screw is turned down or screwed in it will shove down the arm 17 thereby rocking down the carriage l6 and lowering the point of support of the lever 20 and when the thumb-screw is screwed up the pressure of the spring 2% will cause the carriage to rock up and thereby raise the point of support of the lever 20.

My preferred means for actuating the valve lever is arranged as follows :In the plate 1 is formed an opening 30 and in said opening is secured one end of a tube 31 which is made of some metal having a high coefiicient of expansion, such as copper, and the outer end of said tube is closed by a plug 32 which screws into the end thereof. Within the tube 31 is slidably arranged a rod 33 of some material having a low coefiicient of expansion, such as carbon, and the lower end of said rod 33 rests on the plug 32 and the upper end extends into the chamber 3 underneath the lever 20 so as to be in contact with said lever at all times. A screw-threaded boss 35 is formed on the bottom of the plate 1 by means of which the device may be secured to any supporting device 36;

The operation of the device is as follows :After the device has been installed and it has been determined at what temperature the valve shall close, the thumb-screw is turned so that the index finger points to the character on the dial indicating the desired temperature. If a high temperature is to be maintained the screw will be screwed in so as to lower the point of support of the lever 20, and if a lower temperature is to be maintained the screw is turned up thereby raising the point of support of the lever 20. In Fig. 2 the valve is shown closed and therefore the copper tube 31 has been subjected to atemperature high enough to expand it sufficiently to permit the carbon rod 33 to move down and permit the valve to close. Now as the temperature of the medium surrounding the copper tube, lowers the tube will contract thereby shoving up the carbon rod 33 and consequently raising the valve lever and opening the valve.

It will be readily seen that as there is no positive connection between the valve lever and the carbon rod there is therefore no danger of the mechanism becoming strained in case of overheating of the medium surrounding the copper tube, for after the valve is once closed the carbon rod can move away indefinitely from the lever without causing the straining effect which would be produced if the carbon rod and the lever were positively connected.

lVhat I claim is,-

1. In a device of the character indicated, the combination of a valve casing having a dial arranged on the outer surface thereof, a valve seat, a valve arranged to rest on said seat, a carriage pivotally supported in said valve caslng and provided with a forwardly extending arm, a lever fulcrumed in said carriage, one end of said lever being operatively connected with said valve, a coil spring arranged between the opposite end of said lever and the bottom of the valve casing, a screw mounted in the top of the valve casing and adapted to engage with the arm on the carriage, and an index finger mounted on the outer end of said screw and arranged to travel over a dial on the outer surface of said casing.

2. In a device of the character indicated,the combination of a valve casing, a valve seat, a valve arranged to rest onsaidseat,acarriage pivotally supported in said valve casing and provided with a forwardly extending arm, a lever fulcrumed in said carriage, one end of said lever being operatively connected with said valve, a .coil spring arranged between the opposite end of said lever and the bottom of the valve casing, a screw mounted in the top of the valve casing and adapted to engage with the arm on the carriage, a copper tube-having a closed end connected with said valve casing and a carbon rod slidably mounted in said copper tube and arranged to extend into said casing in con tact with said lever.

In testimony whereof, I sign the foregoing specification, in the presence of two Witnesses.

JOHN SABO.

Witnesses: N. L. McDoNNELL, B. 0. BROWN. 

